And this is what I sent him in return, except I included links in my email for each query:
I'm guessing here on the following statement but: I think what you guys take into account is all the factors of cost in owning an NSX which is not factored in with KBB or NADA? It would also appear that the prices you are referencing is perhaps "Average Trade in" value, not "Average Retail Value" I would think that for a website like that, you would want to post what a consumer could expect to pay in retail, not what a dealer might offer as a trade in. Either way, the numbers are very misleading.
Take a 1997 NSX-T 6spd w/83,000 (I recently purchased this vehicle)
KBB suggested private party retail for "very good": $35,779
KBB suggested retail for an "excellent condition (only choice)": $39,979
KBB trade in value ranges from $29,974 - $33,174 (on a fair to excellent scale, it still appears your numbers are quite low)
NADA retail pricing (does not differentiate between private party or dealer) "average retail": $38,800 (low retail $31,700 , average retail $38,800, high retail $49,000)
The average retail value of the 'NSX-T' I purchased just one month ago has gone up from $37,300 to $38,800 according to NADA.
KBB fair value trade in for all years NSX with 50,000 miles (many earlier models will have more but at some point, this stops mattering)
1991 (not listed)
1992 : $25,750
2005 : $57,186
Again, the above is for fair value only. I did not list each year, we can both understand the range given the information provided.
I know auctions use NADA black book (National Auto Dealers Association) and banks use NADA/KBB to determine max finance value. Most financial institutions will allow finance up to the average retail value of a vehicle. Surprisingly, non targa '97+ NSX's are valued at much higher (in the collector world) because they are lighter and therefore quicker but you are right, they book for less.